112 years old now in 2025 - what year born?

Today, 23 January 2025 if a person is 112 years old now, what year was he born? See below:

If 112 years old, year of birth is:
1912 or 1913*

*It depends on whether he was born before or after 1 January 1913.

If now 112 years and his year of birth 1912 if he was born after 23 January 1912 until 31 december 1912 inclusively, and his year of birth is 1913 if he was born from 1 January 1913 to 23 January 1913.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 12 years, year of birth 2012 or 2013
If now 21 years, year of birth 2003 or 2004
If now 48 years, year of birth 1976 or 1977

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